PCI_ALLOC_IRQ_VECTOR(9)                Hardware Interfaces                PCI_ALLOC_IRQ_VECTOR(9)



NAME
       pci_alloc_irq_vectors - allocate multiple IRQs for a device

SYNOPSIS
       int pci_alloc_irq_vectors(struct pci_dev * dev, unsigned int min_vecs,
                                 unsigned int max_vecs, unsigned int flags);

ARGUMENTS
       dev
           PCI device to operate on

       min_vecs
           minimum number of vectors required (must be >= 1)

       max_vecs
           maximum (desired) number of vectors

       flags
           flags or quirks for the allocation

DESCRIPTION
       Allocate up to max_vecs interrupt vectors for dev, using MSI-X or MSI vectors if
       available, and fall back to a single legacy vector if neither is available. Return the
       number of vectors allocated, (which might be smaller than max_vecs) if successful, or a
       negative error code on error. If less than min_vecs interrupt vectors are available for
       dev the function will fail with -ENOSPC.

       To get the Linux IRQ number used for a vector that can be passed to request_irq use the
       pci_irq_vector helper.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   PCI_ALLOC_IRQ_VECTOR(9)